It depends on what kind of suburban housewife we're talking about. Right now I'd guess it would be what we'd call "preppy", slacks and a matching top in all-natural fibers, i.e. cotton in summer, wool in winter. Shoes would be sneakers or loafers.

But if you want to see what it USED to be, take a look at old American TV shows like "Leave it to Beaver" or "Father Knows Best,", or the movie "Pleasantville", where the housewives wore dresses and high heels!